CN114562342A - Method and system for determining opening degree of nozzle ring of variable-section turbocharger - Google Patents
Method and system for determining opening degree of nozzle ring of variable-section turbocharger Download PDFInfo
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- CN114562342A CN114562342A CN202110340522.6A CN202110340522A CN114562342A CN 114562342 A CN114562342 A CN 114562342A CN 202110340522 A CN202110340522 A CN 202110340522A CN 114562342 A CN114562342 A CN 114562342A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
- F01D17/10—Final actuators
- F01D17/12—Final actuators arranged in stator parts
- F01D17/14—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits
- F01D17/16—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of nozzle vanes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
- F01D21/003—Arrangements for testing or measuring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
- F02B37/12—Control of the pumps
- F02B37/24—Control of the pumps by using pumps or turbines with adjustable guide vanes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Engineering & Computer Science (AREA)
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- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Supercharger (AREA)
Abstract
The invention provides a method and a system for determining the opening degree of a nozzle ring of a variable-section turbocharger. According to the method for determining the opening degree of the nozzle ring, the current real opening degree of the nozzle ring can be obtained through the self-learning process of the position of the nozzle ring, and the effectiveness of determining the opening degree of the nozzle ring of the supercharger can be guaranteed.
Description
Technical Field
The invention relates to the technical field of variable-section turbochargers, in particular to a method for determining the opening of a nozzle ring of a variable-section turbocharger, and also relates to a system for determining the opening of the nozzle ring of the variable-section turbocharger based on the method.
Background
The exhaust gas turbocharging technology utilizes the exhaust energy of the engine, can realize the miniaturization design of the engine while improving the power, can effectively improve the oil consumption and the emission of the engine, and has become the mainstream of the application of the exhaust gas turbocharging technology on supercharged engines. At present, in the turbocharging technology, the driving mode of the turbine bypass valve is mainly divided into a pneumatic type and an electric type, and the requirement utilization of the turbine end exhaust energy under different working conditions is realized through the opening degree adjustment of the turbine bypass valve. In addition, the electric driving method is relatively advantageous in application because the pumping loss of the engine can be effectively reduced, the supercharging delay time can be effectively shortened, and the supercharging control stability can be improved.
In the prior art, for a motor-driven turbocharger, the sensing and feedback of the opening of a waste gate valve (abbreviated as EWG) are generally calculated by feedback voltages of the rotation angles of a driving motor at the time of the fully closed position of the bypass valve and at the time of the current position. Due to the reasons of dispersion of parts of the motor and the transmission mechanism, abrasion deformation of parts in the life cycle and the like, the feedback voltage of the fully-closed position of the bypass valve usually drifts relative to the theoretical voltage when leaving a factory, and as a result, the calculation of the true position of the bypass valve is inaccurate, so that the risk of unstable engine supercharging control is brought.
A variable-section turbocharger (VGT or VNT for short) uses a nozzle ring to replace a bypass valve, and the nozzle ring is rotated by pushing a pull rod through a driving motor so as to change the surface-diameter ratio of a turbine, so that wider working condition application and better energy-saving and emission-reducing effects can be realized. For the calculation of the opening of the nozzle ring, the conventional ECU control strategies adopt a bypass valve opening calculation method of an EWG supercharger.
However, compared with the EWG supercharger, the waste gas can not be bypassed when the VGT supercharger is applied, and the waste gas supercharging can be realized only by adjusting the angle of the nozzle ring to change the end face diameter ratio of the vortex. When the angle of the nozzle ring is adjusted to a certain opening (generally, the position is defined as a minimum flow point), a phenomenon that fresh air cannot enter the cylinder due to poor circulation of exhaust gas and a torque suddenly drops occurs, so that a waste gas bypass valve cannot be completely closed like an EWG supercharger when a VGT supercharger is applied.
Therefore, if the nozzle ring opening is calculated by using the method for calculating the bypass valve opening of the EWG supercharger, the nozzle ring opening interval cannot be used from the complete closing position of the nozzle ring to the position of the minimum flow point. But also by component consistency, and by aging wear of supercharger components, there is a risk of engine operation if brought into this opening region.
Disclosure of Invention
In view of this, the present invention aims to provide a method for determining the opening of a nozzle ring of a variable-area turbocharger, so as to ensure the effectiveness of the calculation of the opening of the nozzle ring of the variable-area turbocharger.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a method for determining the opening degree of a nozzle ring of a variable-section turbocharger is used for an engine with the variable-section turbocharger, and the determination method comprises the steps of presetting an initial voltage value of a minimum flow point position and further comprises the following steps:
a. when the engine runs for the first time, acquiring a difference value between a voltage value corresponding to a bottom dead center position of the nozzle ring machinery and a voltage initial value of the minimum flow point position, and recording the difference value as a voltage compensation value;
b. periodically self-learning the position of the nozzle ring during operation of the engine, and the self-learning comprises:
acquiring a voltage value of a bottom dead center position corresponding to the bottom dead center position of the nozzle ring machinery;
adding the collected voltage value at the bottom dead center position and the voltage compensation value to obtain a voltage value at the position of the minimum flow point of the nozzle ring;
calculating a voltage range of the nozzle ring from the position of the minimum flow point of the nozzle ring to the full-open position, and calculating a slope value k of the opening percentage/voltage of the nozzle ring, wherein k is 100%/(voltage value of the full-open position of the nozzle ring-voltage value of the position of the minimum flow point of the nozzle ring);
c. and calculating the current opening alpha of the nozzle ring according to the latest self-learning of the position of the nozzle ring and the current voltage value corresponding to the current position of the nozzle ring, wherein alpha is (the current voltage value-the voltage value at the position of the minimum flow point of the nozzle ring) × k.
Further, when the variable-area turbocharger is operated for the first time, the recording of the voltage compensation value comprises:
the pull rod is pushed by the driving motor to reach the position of the lower dead point of the nozzle ring machinery, and the first voltage value of the corresponding lower dead point position is collected;
calculating a difference value between the acquired first voltage value of the bottom dead center position and the initial voltage value of the minimum flow point position to obtain the difference value;
the difference is recorded as a voltage compensation value.
Further, the determining method further includes determining the acquired first voltage value of the bottom dead center position, and reporting an error if the first voltage value of the bottom dead center position exceeds a preset range.
Further, the acquiring of the voltage value of the bottom dead center position comprises pushing the pull rod to reach the bottom dead center position of the nozzle ring machinery through the driving motor, and acquiring the voltage value of the corresponding bottom dead center position.
Further, the determining method further comprises the step of judging the acquired voltage value of the bottom dead center position, and if the voltage value of the bottom dead center position exceeds a preset range, reporting an error, and continuing to use the voltage value of the position of the minimum flow point of the nozzle ring obtained in the last self-learning.
Further, the determining method further comprises the step of judging the slope value k obtained through calculation, and if the slope value k exceeds a preset range, reporting an error, and continuing to use the slope value k obtained in the last self-learning.
Compared with the prior art, the invention has the following advantages:
according to the method for determining the opening degree of the nozzle ring, the current real opening degree of the nozzle ring can be obtained through the self-learning process of the position of the nozzle ring, the problem of inaccurate opening degree calculation caused by dispersion of parts and abrasion of the parts can be solved, the risks of sudden reduction of the torque of an engine and the like caused by the fact that the opening degree of the nozzle ring enters a position between a minimum flow point and a dead position (namely a position of a mechanical bottom dead center) can be avoided, and the effectiveness of calculation of the opening degree of the nozzle ring of the supercharger can be guaranteed.
Another object of the present invention is to provide a variable-area turbocharger nozzle ring opening determination system for an engine with a variable-area turbocharger, and the determination system includes:
the storage module is used for storing a preset voltage initial value of the position of the minimum flow point;
the first processing module is used for acquiring a difference value between a voltage value corresponding to a bottom dead center position of the nozzle ring machinery and a voltage initial value of the minimum flow point position when the engine runs for the first time, and recording the difference value as a voltage compensation value;
a second processing module for periodic self-learning of nozzle ring position during operation of the engine, the self-learning comprising:
acquiring a voltage value of a bottom dead center position corresponding to the bottom dead center position of the nozzle ring machinery;
adding the collected voltage value at the bottom dead center position and the voltage compensation value to obtain a voltage value at the position of the minimum flow point of the nozzle ring;
calculating a voltage range of the nozzle ring from the position of the minimum flow point of the nozzle ring to the full-open position, and calculating a slope value k of the opening percentage/voltage of the nozzle ring, wherein k is 100%/(voltage value of the full-open position of the nozzle ring-voltage value of the position of the minimum flow point of the nozzle ring);
and the determining module is used for calculating the current opening alpha of the nozzle ring according to the latest self-learning of the position of the nozzle ring and the current voltage value corresponding to the current position of the nozzle ring, wherein alpha is (the current voltage value-the voltage value at the position of the minimum flow point of the nozzle ring) × k.
Further, the determining system further includes:
and the first judgment module is used for judging the acquired first voltage value of the bottom dead center position, and if the first voltage value of the bottom dead center position exceeds a preset range, an error is reported.
Further, the determining system further includes:
and the second judgment module is used for judging the acquired voltage value of the position of the lower dead point, reporting an error if the voltage value of the position of the lower dead point exceeds a preset range, and enabling the second processing module to continue to use the voltage value of the position of the minimum flow point of the nozzle ring obtained in the last self-learning.
Further, the determining system further includes:
and the third judgment module is used for judging the slope value k obtained by calculation, reporting an error if the slope value k exceeds a preset range, and enabling the second processing module to continue to use the slope value k obtained in the last self-learning.
Compared with the prior art, the beneficial effects of the nozzle ring opening determining system provided by the invention are the same as those of the determining method, and are not repeated herein.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a flowchart of a voltage compensation value acquisition record in the determination method according to the embodiment of the present invention;
FIG. 2 is a flow chart of the self-learning and nozzle ring opening determination in the determination method according to the embodiment of the invention;
FIG. 3 is a schematic view of a nozzle ring opening determination system according to an embodiment of the present invention;
description of reference numerals:
100. a storage module; 200. a first processing module; 300. a second processing module; 400. a determining module;
201. a first judgment unit; 301. a second judgment unit; 302. and a third judging unit.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it should be noted that, if terms indicating orientation or positional relationship such as "upper", "lower", "inside", "outside", etc. appear, they are based on the orientation or positional relationship shown in the drawings and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the appearances of the terms first, second, etc. in this specification are not necessarily all referring to the same item, but are to be construed as indicating or implying any particular importance.
In addition, in the description of the present invention, the terms "mounted," "connected," and "connecting" are to be construed broadly unless otherwise specifically limited. For example, the connection can be fixed, detachable or integrated; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. To those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in conjunction with specific situations.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
The embodiment relates to a method for determining the opening degree of a nozzle ring of a variable-section turbocharger, which is used for an engine with the variable-section turbocharger and is integrally designed.
Specifically, as shown in fig. 1, the preset initial value of the voltage at the minimum flow point position is generally written in the turbocharger actuator at the time of factory shipment as a solid flash, and is also written in the engine ECU as a fixed value as a parameter related to the configuration of the turbocharger.
The voltage compensation value is obtained and recorded, specifically, when the engine runs for the first time, the difference value between the voltage value corresponding to the bottom dead center position of the nozzle ring machinery and the initial voltage value of the minimum flow point position is obtained, and the difference value is recorded as the voltage compensation value.
And the voltage value corresponding to the lower dead center position of the nozzle ring machinery is obtained by pushing the pull rod to reach the lower dead center position of the nozzle ring machinery through the driving motor when the variable-section turbocharger runs for the first time, and acquiring the first voltage value of the corresponding lower dead center position. And then, calculating a difference value between the first voltage value of the acquired bottom dead center position and the initial voltage value of the minimum flow point position to obtain the difference value, namely the voltage compensation value (offset). Finally, the voltage compensation value can be recorded, i.e. stored, in the engine ECU.
In addition, after the first voltage value of the bottom dead center position is obtained, the determining method of the embodiment further includes determining and verifying the collected first voltage value of the bottom dead center position, and reporting an error according to a preset relevant diagnostic fault code if the first voltage value of the bottom dead center position exceeds a preset range, that is, is unreasonable.
In conjunction with the periodic self-learning of nozzle ring position as described above in connection with the engine operation shown in fig. 2, the self-learning mode includes the following steps.
Firstly, a voltage value of a bottom dead center position corresponding to the bottom dead center position of the nozzle ring machinery is obtained, the voltage value of the bottom dead center position is obtained by pushing the pull rod to reach the bottom dead center position of the nozzle ring machinery through the driving motor, and the voltage value of the bottom dead center position is acquired at the moment and is also corresponding to the voltage value of the bottom dead center position.
In addition, after the bottom dead center position voltage value is obtained, the determining method of the embodiment further includes determining and verifying the collected bottom dead center position voltage value, and if the bottom dead center position voltage value exceeds a preset range, that is, the obtained bottom dead center position voltage value is unreasonable, an error can be reported according to a preset self-learning failure related fault code. Meanwhile, when the judgment is not reasonable, the voltage value of the position of the minimum flow point of the nozzle ring obtained in the last self-learning is used as the voltage value of the position of the minimum flow point of the nozzle ring required to be obtained in the following self-learning.
Secondly, when the acquired voltage value of the bottom dead center position is judged to be reasonable, the acquired voltage value of the bottom dead center position and the recorded voltage compensation value are further added to obtain the voltage value of the position of the minimum flow point of the nozzle ring.
And finally, calculating the voltage range of the nozzle ring from the minimum flow point position to the full-open position of the nozzle ring, and calculating the gradient value k of the opening percentage/voltage of the nozzle ring, wherein the gradient value k is 100%/the voltage value of the full-open position of the nozzle ring-the voltage value of the minimum flow point position of the nozzle ring.
It should be noted that the voltage value at the position of the minimum flow point of the nozzle ring obtained in the above step is also used as the voltage value corresponding to the position of the minimum flow point of the nozzle ring in the method for determining the opening degree of the nozzle ring according to the present embodiment. Through defining the voltage value that nozzle ring minimum flow point position that obtains above as the voltage value that nozzle ring minimum flow point position corresponds, this embodiment also can avoid the nozzle ring to get into the range of totally shutting down position to minimum flow point position.
The self-learning period of the nozzle ring position of the embodiment is set based on specific design, and meanwhile, the voltage range from the minimum flow point position of the nozzle ring to the full-open position is calculated, the voltage range is the difference value between the voltage corresponding to the full-open position of the nozzle ring and the voltage corresponding to the minimum flow point position of the nozzle ring, and the voltage value corresponding to the full-open position of the nozzle ring can drive the pull rod through the driving motor to enable the nozzle ring to enter the full-open position to be obtained.
In addition, similar to the above judgment and verification of the voltage value at the bottom dead center position, in this embodiment, after obtaining the slope value, the determining method further includes judging and verifying the slope value k obtained through calculation, and if the slope value k exceeds the preset range, that is, if the slope value k is not reasonable, reporting an error based on a preset fault code related to self-learning failure. Meanwhile, in the self-learning step, the slope value k obtained in the last self-learning is also used as the slope value k of the current self-learning.
Still referring to fig. 2, based on the above self-learning of the nozzle ring position, after exiting the self-learning mode, the present embodiment can calculate the current opening α of the nozzle ring according to the latest self-learning of the nozzle ring position and the current voltage value corresponding to the current position of the nozzle ring, and the current opening α is the current voltage value — the voltage value at the minimum flow point position of the nozzle ring. And the obtained opening degree alpha of the nozzle ring is also the actual opening degree of the current nozzle ring.
According to the method for determining the opening degree of the nozzle ring, the current real opening degree of the nozzle ring can be obtained through the self-learning process of the position of the nozzle ring, the problem that the opening degree calculation is inaccurate due to scattering of parts and abrasion of the parts can be solved, risks such as sudden drop of engine torque caused by the fact that the opening degree of the nozzle ring enters a position between a minimum flow point and a bottom dead center of a nozzle ring machine can be avoided, the effectiveness of calculation of the opening degree of the nozzle ring of the supercharger can be guaranteed, and the method has good practicability.
Example two
The present embodiment relates to a nozzle ring opening determination system for a variable geometry turbocharger, which is used for an engine with a variable geometry turbocharger, and the determination system of the present embodiment is a nozzle ring opening determination system based on the determination method of the first embodiment.
At this time, in conjunction with the description of fig. 3, the determination system of the present embodiment includes the storage module 100, the first processing module 200, the second processing module 300, and the determination module 400 as a whole.
The above modules are generally integrated in the engine ECU, and based on the introduction of the first embodiment, the storage module 100 is used to store the preset voltage initial value of the minimum flow point position, and the recorded voltage compensation value and the parameter values in each self-learning can also be stored in the storage module 100.
The first processing module 200 is used for obtaining a difference value between a voltage value corresponding to a bottom dead center position of the nozzle ring machinery and a voltage initial value of a minimum flow point position when the engine runs for the first time, and recording the difference value as a voltage compensation value. The second processing module 300 is used for performing periodic self-learning of the position of the nozzle ring during the operation of the engine, and the content of the self-learning is the same as that in the first embodiment, which is not described herein again.
The determining module 400 is configured to self-learn the position of the nozzle ring at the last time and calculate the current opening α of the nozzle ring according to the current voltage value corresponding to the current position of the nozzle ring, where, of course, the current opening α of the nozzle ring is equal to the current voltage value — the voltage value at the position of the minimum flow point of the nozzle ring.
In addition, in the present embodiment, the first processing module 200 also includes a first determining unit 201, which is used to determine and verify the acquired first voltage value of the bottom dead center position, and report an error when the first voltage value of the bottom dead center position exceeds the preset range.
The second processing module 300 also includes a second determining unit 301 and a third determining unit 302, where the second determining unit 301 is also configured to determine the acquired voltage value at the bottom dead center position, and report an error when the voltage value at the bottom dead center position exceeds a preset range, so that the second processing module 300 continues to use the voltage value at the minimum flow point position of the nozzle ring obtained in the last self-learning.
The third determining unit 302 is configured to determine the slope value k obtained through calculation, report an error when the slope value k exceeds the preset range, and enable the second processing module 300 to continue using the slope value k obtained in the last self-learning.
The specific use process of the determining system of the embodiment refers to the description of the first embodiment, and the determining system of the embodiment can obtain the current real opening of the nozzle ring, can eliminate the problem of inaccurate opening calculation caused by scattering of parts and abrasion of parts, can avoid the risk of sudden drop of engine torque and the like caused by the fact that the opening of the nozzle ring enters the space between the minimum flow point and the shut-off position, can ensure the effectiveness of the calculation of the opening of the nozzle ring of the supercharger, and has good practicability.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A method for determining the opening degree of a nozzle ring of a variable-section turbocharger is used for an engine with the variable-section turbocharger, and is characterized in that: the determining method comprises the steps of presetting a voltage initial value of a minimum flow point position, and further comprising the following steps:
a. when the engine runs for the first time, acquiring a difference value between a voltage value corresponding to a bottom dead center position of the nozzle ring machinery and a voltage initial value of the minimum flow point position, and recording the difference value as a voltage compensation value;
b. periodically self-learning the position of the nozzle ring during operation of the engine, and the self-learning comprises:
acquiring a voltage value of a bottom dead center position corresponding to the bottom dead center position of the nozzle ring machinery;
adding the collected voltage value at the bottom dead center position and the voltage compensation value to obtain a voltage value at the position of the minimum flow point of the nozzle ring;
calculating a voltage range of the nozzle ring from the position of the minimum flow point of the nozzle ring to the full-open position, and calculating a slope value k of the opening percentage/voltage of the nozzle ring, wherein k is 100%/(voltage value of the full-open position of the nozzle ring-voltage value of the position of the minimum flow point of the nozzle ring);
c. and calculating the current opening alpha of the nozzle ring according to the latest self-learning of the position of the nozzle ring and the current voltage value corresponding to the current position of the nozzle ring, wherein alpha is (the current voltage value-the voltage value at the position of the minimum flow point of the nozzle ring) × k.
2. The method of determining the opening degree of the nozzle ring of the variable geometry turbocharger according to claim 1, wherein: when the variable-section turbocharger runs for the first time, the recording of the voltage compensation value comprises the following steps:
the pull rod is pushed by the driving motor to reach the position of the lower dead point of the nozzle ring machinery, and the first voltage value of the corresponding lower dead point position is collected;
calculating a difference value between the acquired first voltage value of the bottom dead center position and the initial voltage value of the minimum flow point position to obtain the difference value;
the difference is recorded as a voltage compensation value.
3. The method of determining the opening degree of the nozzle ring of the variable-area turbocharger according to claim 2, wherein: the determination method further comprises the step of judging the acquired first voltage value of the bottom dead center position, and if the first voltage value of the bottom dead center position exceeds a preset range, an error is reported.
4. The method of determining the opening degree of the nozzle ring of the variable geometry turbocharger according to claim 1, wherein: the acquisition of the voltage value of the bottom dead center position comprises the steps of pushing the pull rod to reach the bottom dead center position of the nozzle ring machinery through the driving motor, and collecting the voltage value of the corresponding bottom dead center position.
5. The method for determining the opening degree of the nozzle ring of the variable-area turbocharger according to claim 4, wherein: the determination method further comprises the steps of judging the acquired voltage value of the bottom dead center position, reporting an error if the voltage value of the bottom dead center position exceeds a preset range, and continuing to use the voltage value of the position of the minimum flow point of the nozzle ring obtained in the last self-learning.
6. The method of determining the opening degree of the nozzle ring of the variable geometry turbocharger according to claim 5, wherein: the determination method further comprises the steps of judging the slope value k obtained through calculation, reporting an error if the slope value k exceeds a preset range, and continuing to use the slope value k obtained in the last self-learning.
7. A variable area turbocharger nozzle ring opening determination system for an engine with a variable area turbocharger, the determination system comprising:
the storage module (100) is used for storing a preset voltage initial value of the position of the minimum flow point;
the first processing module (200) is used for acquiring a difference value between a voltage value corresponding to a bottom dead center position of the nozzle ring machinery and a voltage initial value of the minimum flow point position when the engine runs for the first time, and recording the difference value as a voltage compensation value;
a second processing module (300) for periodic self-learning of nozzle ring position during operation of the engine, and the self-learning comprises:
acquiring a voltage value of a bottom dead center position corresponding to the bottom dead center position of the nozzle ring machinery;
adding the collected voltage value at the bottom dead center position and the voltage compensation value to obtain a voltage value at the position of the minimum flow point of the nozzle ring;
calculating a voltage range of the nozzle ring from the position of the minimum flow point of the nozzle ring to the full-open position, and calculating a slope value k of the opening percentage/voltage of the nozzle ring, wherein k is 100%/(voltage value of the full-open position of the nozzle ring-voltage value of the position of the minimum flow point of the nozzle ring);
and the determining module (400) is used for calculating the current opening alpha of the nozzle ring according to the latest self-learning of the position of the nozzle ring and the current voltage value corresponding to the current position of the nozzle ring, wherein alpha is (the current voltage value-the voltage value at the position of the minimum flow point of the nozzle ring) × k.
8. The variable area turbocharger nozzle ring opening determination system of claim 7, wherein: the first processing module (200) comprises:
and the first judgment unit (201) is used for judging the acquired first voltage value of the bottom dead center position, and if the first voltage value of the bottom dead center position exceeds a preset range, an error is reported.
9. The variable area turbocharger nozzle ring opening determination system of claim 8, wherein: the second processing module (300) comprises:
and the second judging unit (301) is used for judging the acquired voltage value of the bottom dead center position, reporting an error if the voltage value of the bottom dead center position exceeds a preset range, and enabling the second processing module (300) to continue to use the voltage value of the position of the minimum flow point of the nozzle ring obtained in the last self-learning.
10. The variable area turbocharger nozzle ring opening determination system of claim 9, wherein: the second processing module (300) comprises:
and the third judging unit (302) is used for judging the slope value k obtained by calculation, and if the slope value k exceeds a preset range, an error is reported, and the second processing module (300) continues to use the slope value k obtained in the last self-learning.
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